01 - Preheat the oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - In a large mixing bowl, beat eggs, granulated sugar, and salt using an electric mixer on high speed for 5 to 7 minutes until pale, thick, and tripled in volume.
03 - Gently fold in all-purpose flour and vanilla extract with a spatula, taking care not to deflate the mixture.
04 - Evenly divide the batter between prepared pans. Bake for 20 to 25 minutes, or until the sponges are golden and spring back when gently pressed.
05 - Let cakes cool in pans for 10 minutes before turning out onto a wire rack to cool completely.
06 - Using a chilled bowl, whip heavy cream, powdered sugar, and vanilla extract until soft peaks form.
07 - If using, spread a thin layer of strawberry jam over one cooled cake layer.
08 - Spread half the whipped cream over the base cake layer, then arrange half the strawberries on top. Place the second sponge layer over the strawberries.
09 - Spread the remaining whipped cream over the top layer, decorating with the rest of the strawberries.
10 - Garnish with fresh mint leaves if desired. Refrigerate for at least 30 minutes before slicing for clean portions.